One of the most unique things about grassroots movements that a lot of people don’t realize is that they have the potential to pick up some pretty incredible, and oftentimes unexpected, allies as they grow in size and scope. Along the way, these new allies lend their own talents, perspectives, advice and more the movement. And sometimes, these allies end up being pretty influential simply by being themselves, as many people have especially noted with celebrities. Most celebrities, love ’em or hate ’em (and love or hate the system for that matter), are one-man or one-woman media outlets with the...